WHAT ARE TROJAN HORSE VIRUSES AND HOW CAN YOU PREVENT THEM?

The term trojan horse originated from the Trojan War story. A wooden horse filled with murderous Greeks led to the destruction of the Troy Kingdom.

In computing, a trojan horse works in much the same way. It pretends to be a useful application to lure in victims. Once installed, a trojan horse is harmful in many ways, which is why it’s important that you know what are trojan horse viruses.

WHAT DO TROJAN HORSE VIRUSES DO?

Once you become aware of what are trojan horse viruses and what can they do to your computer, you can learn to avoid them.

Creates Backdoor Access

A Trojan horse creates backdoor access that allows a hacker to take control of the computer. It alters the security setting of the device to gain administrator privileges and create a backdoor without being exposed. Backdoor access allows the hacker to copy, delete, and modify critical data on the computer. That’s what are trojan horse viruses and what are they capable of.

Steals Personal Information

A trojan horse can also steal personal information, such as usernames, passwords, credit card numbers, and bank account numbers. It monitors your computer activity silently in the background to record sensitive information, then transmits the information to the hacker via a remote server.

Installs Malicious Software

When learning what are trojan horse viruses, you must remember that their main goal is to install malicious software. It is often bundled with spyware, ransomware, rootkits, and keyloggers. It can perfectly conceal the malicious software behind its deceptively innocent appearance.

DDoS Attacks

A trojan horse can also be used to conduct a DDoS attack. It can flood networks, web servers, and IT infrastructures with unwanted traffic, resulting in downtime. The attack may last from a day to a month, depending on the severity of the damage and incident response of the company. This is big reason they are so dangerous and learning what are trojan horse viruses is important.

Conceals Malicious Activities

A trojan horse can be programmed to load and execute directly from computer memory, enabling it to modify critical data. Then it protects the malicious activities of the other malware on the computer. A trojan horse operating from computer memory is difficult to detect because its script is invisible in the file system.

Now that we know what are trojan horse viruses and what are they capable of, it is important to keep your computer protected to avoid data theft. How can you prevent a trojan horse attack?

Trojan vs Virus

How Does a Trojan Horse Attack Work?

A typical Trojan attack follows these stages:

1. The attacker disguises malware as legitimate software.
2. The user downloads or installs the file.
3. The Trojan executes in the background.
4. The malware establishes communication with the attacker.
5. Additional malware may be downloaded.
6. Sensitive data is stolen or systems are compromised.

Unlike viruses, Trojans depend heavily on social engineering to gain access.

WAYS TO PREVENT TROJAN HORSE VIRUSES

Verify URLs

A trojan horse can be installed through a malicious link that redirects users to malware-infected websites. To prevent a trojan horse hiding behind a fake URL, scan the URL first with a website scanner online. You can use a third-party scanner such as Xcitium Website Inspector to verify the reputation of the website.

Delete Suspicious Emails

Hackers can attach a trojan horse to malicious emails and send them to random computers. Unless the computer user knows what are trojan horse viruses and how to prevent them, their device will get infected with a trojan horse when they open the email. An advanced form of a trojan horse will gain direct access to computer memory without the user having to download an attachment.

Avoid Visiting Illicit Websites

Malware like a trojan horse is often found on illicit websites. They have malicious advertisement pop-ups designed to install malware when the user closes them out.

Avoid Downloading Cracked Software

The problem with cracked software is that it may come with a virus. Most cracked versions of software are embedded with data-stealing malware such as trojan horses, spyware, and ransomware. One way to prevent a trojan horse infection is to only download applications from verified publishers. Today, hackers can easily spread fake software on the internet.

Install Anti Malware Software

Anti malware software is the best tool to protect your computer from a trojan horse attack, whether you know what are trojan horse viruses or not. Designed to prevent varieties of malware and cyber attacks, anti malware software can identify a trojan horse and other types of malware in no time. It combines traditional and modern techniques to detect and block malware quickly. With anti malware software installed on your computer, your valuable files and personal information are safe from malware attacks.

Common Types of Trojan Horses

Examples of Famous Trojan Horse Attacks

Zeus Trojan

One of the most notorious banking Trojans, Zeus stole financial credentials from millions of users worldwide.

Emotet

Originally a banking Trojan, Emotet evolved into a malware delivery platform used to distribute ransomware and other threats.

TrickBot

A modular Trojan used for credential theft, network reconnaissance, and ransomware deployment.

QakBot

A sophisticated Trojan that targets enterprise networks and often serves as an entry point for ransomware attacks.

Adding examples increases authority and E-E-A-T signals.

How Do You Know If You Have a Trojan Horse Virus?

Common signs include:

• Slow system performance
• Unexpected pop-up advertisements
• Unknown applications appearing
• Browser redirects
• Disabled antivirus software
• Unusual network activity
• Unauthorized account access
• Frequent system crashes

Organizations should investigate these indicators immediately to prevent further compromise.

How Do Trojan Horses Spread?

Trojan malware is commonly delivered through:

• Phishing emails
• Malicious attachments
• Fake software downloads
• Cracked or pirated software
• Infected websites
• Malvertising campaigns
• Social engineering scams
• Fake software updates

Cybercriminals rely on user trust to convince victims to execute Trojan files.

Why Trojan Horses Are Dangerous for Businesses

For organizations, Trojan infections can lead to:

• Credential theft
• Data breaches
• Ransomware deployment
• Unauthorized remote access
• Intellectual property theft
• Compliance violations
• Business disruption
• Financial losses

Modern Trojans often act as the first stage of larger cyberattacks targeting enterprise environments.

How to Protect Against Trojan Horse Malware

Organizations can reduce Trojan infections by:

1. Using advanced endpoint protection.
2. Blocking malicious email attachments.
3. Training employees to recognize phishing attacks.
4. Keeping software updated.
5. Enforcing least-privilege access controls.
6. Monitoring endpoint activity conti

Conclusion What Are Trojan Horse Viruses

Xcitium Now that we have a better understanding of what are trojan horse viruses capable of and how to prevent them, never leave your computer vulnerable. If you want to keep your files and information safe, install reputable anti malware software on your computer.

FAQ

What is a Trojan horse virus?

A Trojan horse is a type of malware that disguises itself as legitimate software to trick users into installing it. Once activated, it can steal data, create backdoors, or install additional malware.

Is a Trojan horse the same as a virus?

No. A Trojan horse relies on deception to infect devices, while a virus can self-replicate and spread to other files or systems.

How do Trojan horses infect computers?

Trojan horses typically infect computers through phishing emails, malicious downloads, fake software updates, and compromised websites.

What damage can a Trojan horse cause?

Trojans can steal credentials, monitor activity, install ransomware, provide remote access to attackers, and compromise sensitive data.

Can antivirus software detect Trojan horses?

Yes. Modern endpoint security solutions can detect known Trojans and identify suspicious behaviors associated with new Trojan variants.

What are the most common Trojan horse types?

Common types include banking Trojans, remote access Trojans (RATs), downloader Trojans, spyware Trojans, and credential-stealing Trojans.